GG Man - Deb, Fertilization of ponds is a method to increase natural productivity and increase or enhance the food chain which provides more natural food for the fish, thus more growth or fish biomass is realized, supported or obtained. Fertilizations by increasing the plankton component of the water column, reduces sunlight penetration which inhibits growth of submerged rooted vegetation on the pond bottom. Fertilization produces somewhat similar results as feeding fish food and using pond dye (Aquashade). Many other brand name dyes are mearly make up and do not adequately suppress rooted vegetation. A search of previous posts will provide much more discussion about these topics.
